Yaru Liu, Yinnian He & Xinlong Feng. (2024). Stability and Convergence of the Integral-Averaged Interpolation Operator Based on $Q_1$-Element in $\mathbb{R}^n$. Numerical Mathematics: Theory, Methods and Applications. 17 (2). 494-513. doi:10.4208/nmtma.OA-2023-0122